[docs] Update playground link to https

tonyganch · Apr 14, 2019 · cb4be1c · cb4be1c
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 Gonzales PE is a CSS parser which plays nicely with preprocessors.    
 Currently those are supported: SCSS, Sass, LESS.    
-Try out Gonzales PE online: [Gonzales PE Playground](http://tonyganch.io/gonzales-pe/).
+Try out Gonzales PE online: [Gonzales PE Playground](https://tonyganch.io/gonzales-pe/).
 
 ## Install